激光清洗对增材制造5A06铝合金的影响

Effect of Laser Cleaning on Additive Manufacturing of 5A06Aluminum Alloy

铝合金因其优异的性能具有广泛的应用前景。但在增材制造中,铝合金的高温熔化,在每层金属之间形成氧化膜,对材料的力学性能产生恶劣影响。激光清洗工艺可以有效去除每层合金之间的氧化膜,提高材料整体的力学性能。结果表明:通过激光共聚焦显微镜的观察,激光清洗后5A06铝合金表面形貌平整。通过表面元素检测,5A06铝合金表面氧元素质量从19.85%下降到1.74%,氧化膜被去除。对激光清洗后的5A06铝合金进行力学性能测试,未经过激光清洗和经过激光清洗的材料表面硬度相差不大,约为85 HV。未经过激光清洗的5A06铝合金试样拉伸强度为268.833 MPa,经过激光清洗的5A06铝合金试样拉伸强度为293.5 MPa,拉伸强度的提升说明激光清洗有效改善了力学性能。

Aluminum alloy has a wide range of application prospects because of its excellent performance.But in additive manufacturing,the high temperature melting of aluminum alloys,which forms oxide films between each layer of metal,has a negative impact on the mechanical properties of the material.The laser cleaning process can effectively remove the oxide film between each alloy layer and improve the overall mechanical properties of the material.The results show that by laser confocal microscope observation,the surface shape of 5A06aluminum alloy is flat after laser cleaning.By surface element testing,the oxygen element content on the surface of 5A06aluminum alloy decreases from 19.85%to 1.74%,and the oxide film is removed.The 5A06aluminum alloy after laser cleaning is tested for mechanical properties,and the difference in surface hardness between the material without laser cleaning and after laser cleaning is about 85 HV,which is not significant.The tensile strength of the specimen of 5A06aluminum alloy without laser cleaning is 268.833MPa,and the tensile strength of the specimen of 5A06aluminum alloy after laser cleaning is 293.5MPa.The improvement in tensile strength shows that the laser cleaning effectively improves the mechanical properties.